Bulletin of the Museum of Comparative ZoSlogy 

 AT HARVARD COLLEGE. 

 Vol. LXIII. No. 2. 



SOME CRITICAL NOTES ON BIRDS. 



By Outram Bangs and Thomas E. Penard. 



CAMBRIDGE, MASS., U. S. A.: 

 PRINTED FOR THE MUSEUM. 

 June, 1919. 



